Assessment of macula function recovery using MAIA microperimetry after Epiretinal membrane peeling surgery.

Patients who are diagnosed with Epiretinal Membrane who will undergo microperimetric testing pre and Pars plana vitrectomy membrane peeling surgery. Exposure being studied in this study: Fundus- driven microperimetry Microperimetry is a technology that allows concurrent analysis of structural and functional aspects of the retina. It combines fundus imaging, retinal sensitivity mapping and fixation analysis in one exam and has been used over a decade as a powerful tool to detect, describe and follow-up pathologies affecting the macular area. Its great advantage is the ability to track patients’ fixation activity while measuring visual field, hence eliminating errors caused by fixation losses. It is a non-invasive test and can be easily performed by most patients including those with low vision. It works by presenting light stimuli it a unit (one eye is occluded at a time) and the patient is given a button which they press when the stimulus is detected. The microperimetry test will be conducted on the patients by a member of the research team (Ophthalmic registrar, clinical research officer) using a standardised protocol at the clinic. The test takes approximately 5 mins per eye. We will try to ensure the same operator will conduct subsequent follow up test for a particular patient. The baseline test will be performed within 4 weeks prior to the patient undergoing surgery and then at 1,3,6 and 12 months post surgery. The data will be collected at these time points.